CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 54,910	$ 45,843
Short-term investments	23,354	21,689
Receivables (net of allowances of $319 in 2013 and $283 in 2012)	40,005	30,694
Inventories	26,786	19,597
Prepaid expenses and other current assets	3,319	5,423
Net deferred tax assets, current	4,589	4,151
Total current assets	152,963	127,397
Long-term investments	17,000	23,442
Investment in unconsolidated affiliate	2,613	2,626
Property and equipment, net	25,330	24,296
Intangible assets, net	3,122	3,990
Net deferred tax assets, non-current	643	0
Other assets	92	85
Total assets	201,763	181,836
Current liabilities:
Accounts payable	8,123	6,381
Accrued payroll and related expenses	6,261	6,336
Accrued taxes	440	266
Other accrued liabilities	2,838	1,991
Deferred revenue	1,362	1,212
Warranty reserve	995	1,245
Total current liabilities	20,019	17,431
Non-current liabilities:
Deferred rent	729	641
Net deferred tax liabilities	0	199
Deferred revenue	3,750	2,396
Warranty reserve	389	601
Notes payable, less current portion	682	783
Total non-current liabilities	5,550	4,620
Total liabilities	25,569	22,051
Commitments and contingencies (Note 10)
Shareholders' equity:
Preferred stock, no par value: 5,000,000 shares authorized; no shares issued and outstanding in 2013 and 2012	0	0
Common stock, no par value: 35,000,000 shares authorized; 22,120,000 and 21,699,000 shares issued and outstanding in 2013 and 2012, respectively	121,019	110,063
Retained earnings	55,133	49,697
Accumulated other comprehensive income	42	25
Total shareholders' equity	176,194	159,785
Total liabilities and shareholders' equity	$ 201,763	$ 181,836